Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Food Production Allergen Containment

Food Production Allergen Containment

Food Production Allergen Containment

A food research/pilot plant wants to devote a small room to testing foods containing allergens (mostly peanuts). Right now the entire facility is served with a VAV system from a central unit, and there are no allergens present. This new allergen area will have to be kept negative to the adjacent spaces, and no return air can be pulled from this space.

So I was thinking of still using the supply air to the allergen space from the VAV system, but not returning any air, Instead, a separate exhaust system would be installed sending all air to the outdoors. I need to make sure that the central system has the capacity to bring in the additional OA.

The VAVs will have reheat coils for temperature control. I am debating on whether or not I need something as precise as Phoenix valves in lieu of VAV boxes? Exhaust could be whatever I want, which will no doubt consist of variable speed based on differential between the allergen room and the adjacent spaces.

I am looking into any codes or other standards that might be applicable. Job is in Chicago.

Any input would be appreciated.

RE: Food Production Allergen Containment

Failure of exhaust results in positive pressure and contamination of adjacent spaces.

RE: Food Production Allergen Containment

Usually for containment rooms HVAC needs to be operational 24hrs.Please check if the central AHU will meet this requirement.HVAC alone does not provide containment so consider having an airlock at the entrance of containment room. Please check if the exhaust requires any filtration.

RE: Food Production Allergen Containment

I would be more careful of the exhaust air, as I've heard cases where exhaust air was next to the inlet air for the rest of the system, resulting in cross contamination. One other thing to consider is whether the exhaust air should go through a scrubber.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Food Production Allergen Containment

I'd go for a separate small A/C unit for the space. Then, loss of either the main A/C or the small room A/C will not drive contamination out of the small space. A simple pressure controlled exhaust fan will then suffice to keep the room negative. If no doors are being fanned (night or weekends) energy used for isolation could drop to very low levels.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Food Production Allergen Containment

You also need to address how to avoid contamination with people going in and out of the room. Airlock and disposable gowns, shoe and hair covers would be required. Itsmoked recommendation is good.

RE: Food Production Allergen Containment

Doesn't sound like you have nearly enough information yet.

What ISO level or how many air changes are you required? What are you trying to isolate, as if it is allergens only and not things on the ACGIH or OSHA Table, or carcinogenic or agent, risk might go down. Will HEPA's be required and do you have discharge velocities on exhaust for plume to meet? Is the work critical and does it need to be on emergency power?

Are you protecting the product, the personnel or both (is work going to be under a hood, a BSC or isolator)?

I've worked under BMBL, AAALAC and USP 797/800 criteria and not sure if this would match with FDA requirements (if they even need to be followed). Otherwise I would have guessed requiring USP 797/800. If work is under an isolator, then you would only need slight negative pressure (o.01 IWC), no antechamber and 12 ACH. If going full blown clean room you'd probably need ISO 5 (BSC) with ISO 7 work room and ISPO 8 antechamber.

Not much to work with. Would the chemicals involved even require eye wash?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close